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https://issues.apache.org/jira/browse/DRILL-6318?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oleg Zinoviev updated DRILL-6318:
---------------------------------
    Summary: Push down limit past flatten is incorrect  (was: Push down limit 
into flatten is incorrect)

> Push down limit past flatten is incorrect
> -----------------------------------------
>
>                 Key: DRILL-6318
>                 URL: https://issues.apache.org/jira/browse/DRILL-6318
>             Project: Apache Drill
>          Issue Type: Bug
>    Affects Versions: 1.13.0, 1.14.0
>         Environment: Ubuntu Mate 18.04
> Apache Drill 1.14.0-SNAPSHOT
>            Reporter: Oleg Zinoviev
>            Priority: Major
>         Attachments: sample.json
>
>
> Sample data: [^sample.json]
> Result of
> {code:sql}
> select flatten(data) as d from dfs.root.`sample.json`
> {code}
> is
> ||d||
> |Honored Boy Scout|
> |Yawning Wolf|
> |Closed Queen|
> |Innocent Volunteer|
> |Junior Wing|
> |Lame Mantis|
> |Old Master|
> |Numb Pawn|
> |Hollow Guardian|
> |Twin Hurricane|
> |Helpless Avalange|
> Let's try to get first 3 rows:
> {code:sql}
> select flatten(data) as d from dfs.root.`sample.json` limit 3
> {code}
> Result has only 2 rows:
> ||d||
> |Honored Boy Scout|
> |Yawning Wolf|
> *Reason:* Limit was pushed down below flatten and only 3 top rows from json 
> was selected. In this 3 rows only 2nd has items in "data" field.
> Let's try to get 3 rows from the middle:
> {code:sql}
> select flatten(data) as d from dfs.root.`sample.json` limit 3 offset 5
> {code}
> Result is empty.
> *Reason:* Limit and offset was pushed down below flatten and only 6, 7 and 8 
> row from json was selected. This 3 rows contains only 3 items in "data" 
> field. After flatten limit and offset applies second time and reject all 
> select items.
> Error in org/apache/drill/exec/planner/logical/DrillPushLimitToScanRule.java



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